Variable: word-wrap-whitespace-mode-hook
word-wrap-whitespace-mode-hook is a customizable variable defined in
word-wrap-mode.el.gz.
Value
(word-wrap-whitespace-mode-set-explicitly(var)/word-wrap-whitespace-mode-set-explicitly(fun))
Documentation
Hook run after entering or leaving word-wrap-whitespace-mode(var)/word-wrap-whitespace-mode(fun).
No problems result if this variable is not bound.
add-hook automatically binds it. (This is true for all hook variables.)
Source Code
;; Defined in /usr/src/emacs/lisp/textmodes/word-wrap-mode.el.gz
;;;###autoload
(define-minor-mode word-wrap-whitespace-mode
"Allow `word-wrap' to fold on all breaking whitespace characters.
The characters to break on are defined by `word-wrap-whitespace-characters'."
:group 'display
(if word-wrap-whitespace-mode
(progn
(setq-local word-wrap-mode--previous-state
(cons (category-table)
(buffer-local-set-state
word-wrap-by-category t
word-wrap t)))
(set-category-table (copy-category-table))
(dolist (char word-wrap-whitespace-characters)
(modify-category-entry char ?|)))
(set-category-table (car word-wrap-mode--previous-state))
(buffer-local-restore-state (cdr word-wrap-mode--previous-state))))